Journal
ACS PHOTONICS
Volume 4, Issue 6, Pages 1350-1354Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.7b00410
Keywords
antireflection; nanoantenna; photoconductive; plasmonic; terahertz
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Funding
- NSERC 121 grant
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Plasmon-enhanced photoconductive antennas allow for improved performance, particularly in below-band-gap absorption devices using low-temperature-grown GaAs. Here we design the plasmonic nanostructures to act as antireflection coatings as well, achieving below 10% reflection at 1570 nm wavelength in an optimized device. Quantitative agreement is seen between experiment and theory. Terahertz emission field amplitudes demonstrate 18 times enhancement compared to that of a conventional terahertz photoconductive antenna on the same substrate.
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